Design of taper coupler for effective laser and single mode fiber coupling with large tolerance

Jing Zhang; V. Ramana Pamidighantam; John Hon-Shing Lau; Qingxin Zhang; Chandrappan Jayakrishnan; Chee Wei Tan; Ming Chinq Jong; Teo Wei Liang Calvin; Dim Lee Kwong

doi:10.1117/12.746624

12 December 2007 Design of taper coupler for effective laser and single mode fiber coupling with large tolerance

Jing Zhang, V. Ramana Pamidighantam, John Hon-Shing Lau, Qingxin Zhang, Chandrappan Jayakrishnan, Chee Wei Tan, Ming Chinq Jong, Teo Wei Liang Calvin, Dim Lee Kwong

Author Affiliations +

Proceedings Volume 6782, Optoelectronic Materials and Devices II; 67821L (2007) https://doi.org/10.1117/12.746624
Event: Asia-Pacific Optical Communications, 2007, Wuhan, China

Abstract

A new method of coupling the light from a laser diode to a Single Mode Fiber (SMF) with large alignment tolerances and without using coupling lenses is presented. A pseudo vertical tapered coupler is designed for light coupling between laser diode and single mode fiber. It has a large input aperture which is about 100 times the size of the laser waveguide cross-section. The tapered coupler provides single mode output and matches the mode size with the single mode fiber. The tapered coupler is fabricated on a silicon optical bench and is located between the laser and the fiber through the silicon micrfabrication process. The misalignment between the fiber and taper coupler can be very small since this is controlled by high precision silicon optical bench patterning processes. The coupler relaxes the laser diode placement accuracies and eliminates the need for a coupling lens. Design Studies showed that the tolerance between the laser diode and taper coupler can be more than +/-5μm misalignment at x-y, and +/-0.5degree tilting angle tolerance and the fabricated assembly results are encouraging with good placement tolerances and coupling efficiency. The laser to single mode fiber coupling tolerances is greatly improved and passive alignment for laser and single mode fiber is realized. The technology can be useful for multi channel optical assembly where significant device and process cost saving can be achieved and is suitable for functional integration for silicon photonics.

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Jing Zhang, V. Ramana Pamidighantam, John Hon-Shing Lau, Qingxin Zhang, Chandrappan Jayakrishnan, Chee Wei Tan, Ming Chinq Jong, Teo Wei Liang Calvin, and Dim Lee Kwong "Design of taper coupler for effective laser and single mode fiber coupling with large tolerance", Proc. SPIE 6782, Optoelectronic Materials and Devices II, 67821L (12 December 2007); https://doi.org/10.1117/12.746624

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KEYWORDS

Semiconductor lasers

Single mode fibers

Tolerancing

Fiber lasers

Silicon

Waveguides

Optical benches

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